Subject: Re: Help in choosing a license
From: Arnoud Engelfriet <>
Date: Sun, 13 Feb 2005 20:47:18 +0100

Alex Bligh wrote:
> Assuming (1) has precedence over (3), you could consider achieving this by
> dual licensing. License the code under the GPL to achieve something like
> (1) [note the GPL does not prevent people for charging for software so long
> as they also provide the source etc. for free - in practice this may limit
> what they charge if they are to make many sales]. Write a commercial
> license to achieve (2) and (3), and charge nothing or a very small amount
> for it in the circumstance of (3) that applies.

This kind of dual licensing model only works if the target for
the commercial license doesn't want to accept the GPL. Typically
that's because they don't want to GPL-license their own software.

But for internal use the GPL has no obligation to release any
source. In such a situation it seems quite possible to use the
GPL version. That would undermine the desired objective.


Arnoud Engelfriet, Dutch patent attorney - Speaking only for myself
Patents, copyright and IPR explained for techies: